在Javascript中查找要更改以获得等效二进制数的位数

let decimalNumber = 10;
let binaryString = decimalNumber.toString(2);
console.log(binaryString); // 输出: "1010"

let bitCount = binaryString.length;
console.log(bitCount); // 输出: 4

let desiredBitCount = 8;
if (bitCount < desiredBitCount) {
  binaryString = "0".repeat(desiredBitCount - bitCount) + binaryString;
} else if (bitCount > desiredBitCount) {
  binaryString = binaryString.slice(bitCount - desiredBitCount);
}
console.log(binaryString); // 输出: "00001010"